Classification / Names
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Cichliformes (Cichlids, convict blennies) >
Cichlidae (Cichlids) > Cichlasomatinae
Etymology: Krobia: Vernacular name of different fishes in Surinam (Ref. 45335); petitella: Named from the Latin petitus, reaching out for or inclining towards, in reference to the lateral band spots lying adjacent to the upper lateral line anteriorly and intercepting posteriorly. An adjective in feminine form.
Environment: milieu / climate zone / depth range / distribution range
Ekologi
; sötvatten bentopelagisk; pH range: 4.2 - 7.1. Tropical; 25°C - 33°C (Ref. 93940)
South America: Berbice River drainage in Guyana.
Size / Vikt / Age
Maturity: Lm ? range ? - ? cm
Max length : 10.2 cm SL hane/ej könsbestämd; (Ref. 93940)
Short description
Bestämningsnycklar | Morfologi | Morfometri
Taggstrålar i ryggfenan (totalt) : 12 - 14; Mjukstrålar i ryggfenan (totalt) : 9 - 11; Taggstrålar i analfenan: 3; Mjukstrålar i analfenan: 7 - 8; Ryggkotor: 24 - 25. This species differs from all its congeners (Krobia guianensis Regan, K. itanyi Puyo and K. xinguensis Kullander) as well as the closely related ‘Aequidens’ potaroensis and ‘A’. paloemeuensis by tubed scales of the upper lateral line extending caudally into a line bisecting the lateral band blotches posterior to the mid-lateral spot. It can be further distinguished by the anterior lateral band spots lying immediately ventral to the upper lateral line, instead of being separated from the upper lateral line by a complete row of scales in all other species. It also possesses a unique lateral coloration pattern formed by the combination of six vertical bars and four lateral band spots (vs. 5 bars/3 or 4 spots in K. itanyi, 5/5 in K. guianensis, 7/6 in K. xinguensis, 6/6 in ‘Aequidens’ potaroensis, 5/5 in ‘A’. paloemeuensis). It can be further diagnosed by the combination of the following characters: separation of the caudal spot on the dorsal caudal fin lobe from the lower lateral line by one scale length; lacking a lateral band spot in bar 2; presence of two distinct interorbital stripes and a prominent preorbital stripe; significantly longer snout and longer fins than K. guianensis on average; lateral band extending to the posterior base of the dorsal fin; and lacking anterolateral spots on the lower jaw and a lateral band blotch located in the second vertical bar as seen in K. xinguensis in addition to having a longer snout and shallower body than K. xinguensis on average. It differs from ‘Aequidens’ potaroensis and ‘A.’ paloemeuensis by lacking lateral band spots on the caudal peduncle; and from ‘A.’ potaroensis by having a significantly deeper head, body and caudal peduncle as well as longer fins on average (Ref. 93940).
Collected from a black water river with pH ranging from 4.2-7.1, conductivity of 2.0-39.0 μS , temperature of 25.0-33.3°C, current velocity typically ranging from 0.1-0.3 m/s, dissolved oxygen of 5.1-6.7 mg/L and Secchi depth 0.7-1.0 m (Ref. 93940).
Life cycle and mating behavior
Könsmognad | Reproduktion | Lek | Ägg | Fecundity | Larver
Steele, S.E., E. Liverpool and H. López-Fernández, 2013. Krobia petitella, a new species of cichlid fish from the Berbice River in Guyama (Teleostei: Cichlidae). Zootaxa 3693(2):152-162. (Ref. 93940)
IUCN Red List Status (Ref. 130435: Version 2024-2)
Threat to humans
Harmless
Human uses
Verktyg
Special reports
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5625 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.02291 (0.01064 - 0.04934), b=3.07 (2.89 - 3.25), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Trofisk nivå (Ref.
69278): 3.3 ±0.5 se; based on size and trophs of closest relatives
Resiliens (Ref.
120179): Hög, lägsta populationsfördubblingstid mindre än 15 månader (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
